In this paper, hot compression behaviour of Al7075 in the temperature range of 573–723 K and the strain rate range of 0.001–0.1 s-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hbox {s}^{-1}$$\end{document}, based on standard requirements, was studied. The prediction of flow stress was performed using constitutive equations based on the basic and modified-Johnson–Cook model and the accuracy of the proposed models was estimated by comparing with the experimental results by the statistical error analysis method. Based on the experimental results, flow stress is changed significantly with changes in the strain rate and temperature. However, the basic model cannot predict the correlated effects of these parameters which decrease its accuracy of model, the flow stress of the materials especially at high temperatures. During the calculation of the constants based on the modified model, the effects of hardening and softening behaviour were included in addition to considering the correlated effects of the parameters. The accuracy of the modified model increased significantly when compared with experimental results.

中文翻译：

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使用 Johnson-Cook 模型对 Al7075 进行本构建模

在本文中，Al7075 在 573–723 K 温度范围和 0.001–0.1 s-1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage 温度范围内的热压缩行为{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\hbox {s}^{-1} $$\end{document}，基于标准要求，进行了研究。使用基于基本模型和修正的Johnson-Cook 模型的本构方程进行流动应力的预测，并通过统计误差分析方法与实验结果进行比较来估计所提出模型的准确性。根据实验结果，流变应力随着应变速率和温度的变化而显着变化。然而，基本模型无法预测这些参数的相关影响，从而降低了模型的准确性，尤其是在高温下材料的流动应力。在基于修正模型的常数计算过程中，除了考虑参数的相关影响外，还包括硬化和软化行为的影响。与实验结果相比，修改后的模型的准确性显着提高。